Term
| Putting the Elements in Order |
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Definition
H Li Be B C N O F Na Mg Al Si P S Cl K Ca Ti V Cr
Mendeleev noted that elements with common properties appear at regular intervals when ordered by mass, like the low-density reactive metals highlighted (in red) above.
Mendeleev noted that elements with common properties appear at regular intervals when
ordered by mass, like the low-density reactive metals highlighted (in red) above. |
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Term
| Predicting with Properties |
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Definition
lithium, sodium, potassium, and rubidium. These low-density metals all react violently with water.
Based on the properties of the elements in these groups,Mendeleev
predicted some of the properties, (such as density and melting point)
of elements that would fill the gaps in his table. |
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Term
| Pointing the Way to the Future |
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Definition
| Mendeleev, by using the collective observations and analysis of the chemistry community, created a model that not only explained how the elements are grouped, but also pointed the way to understanding the nature of matter itself. |
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Term
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Definition
| Discovered that masses of the elements involved in chemical reactions are always in certain proportions. |
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